Renamed 2nd device file back to dumpstate_board.bin.

Fixes: 62872793
Test: manual verification
Test: mmm -j32 frameworks/native/cmds/dumpstate/ && adb push $OUT/system/lib/libdumpstateutil.so /system/lib/ && adb push ${ANDROID_PRODUCT_OUT}/data/nativetest/dumpstate_test* /data/nativetest && adb shell /data/nativetest/dumpstate_test/dumpstate_test

Change-Id: I3574124be9d430b92a08531cff412e88f4469fa6